Within a <menus> section, each menu is defined, not by a <menu> tag, but
by a <pgc>. Within a <titles> section, each title is defined, not by a
<title> tag, but by a <pgc>.
This was done because "PGC" is the term used in the DVD-Video spec for
both objects. And they do indeed have a lot in common. But is that
enough reason to try to unify them?
In particular, a menu PGC can have an "entry" type, identifying it as
one of the special menus that you can jump to with standard buttons on
your player, while a title PGC cannot have this.
The way dvdauthor enforces this is a little roundabout: instead of
reporting an error at the time of parsing the <pgc> directive, if it
sees an entry attribute that shouldn't be there, or that has an
inadmissible value, checking of this is deferred to a validation routine
invoked at the end of a <vmgm> or <titleset> section, where you're
liable to see a message like
ERR: Entry <entry> is not allowed for menu type <type>
where "<type>" can be "VTSM" for a titleset menu, "VMGM" for a VMG menu,
or "VTS" for a title that isn't a menu at all. Seems like a slightly
confusing message in this last case, doesn't it?
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